Highly selective terahertz bandpass filters based on trapped mode excitation
Open Access
- 30 September 2009
- journal article
- Published by Optica Publishing Group in Optics Express
- Vol. 17 (21), 18590-18595
- https://doi.org/10.1364/oe.17.018590
Abstract
We present two types of metamaterial-based spectral band-pass filters for the terahertz (THz) frequency range. The metamaterials are specifically designed to operate for waves at normal incidence and to be independent of the field polarization. The functional structures are embedded in films of benzocyclobutene (BCB) resulting in large-area, free-standing and flexible membranes with low intrinsic loss. The proposed filters are investigated by THz time-domain spectroscopy and show a pronounced transmission peak with over 80% amplitude transmission in the passband and a transmission rejection down to the noise level in the stopbands. The measurements are supported by numerical simulations which evidence that the high transmission response is related to the excitation of trapped modes.Keywords
This publication has 19 references indexed in Scilit:
- A spatial light modulator for terahertz beamsApplied Physics Letters, 2009
- A metamaterial solid-state terahertz phase modulatorNature Photonics, 2009
- Comparison of birefringent electric split-ring resonator and meanderline structures as quarter-wave plates at terahertz frequenciesOptics Express, 2008
- Hiding under the Carpet: A New Strategy for CloakingPhysical Review Letters, 2008
- Plasmon-Induced Transparency in MetamaterialsPhysical Review Letters, 2008
- Sharp Trapped-Mode Resonances in Planar Metamaterials with a Broken Structural SymmetryPhysical Review Letters, 2007
- Active terahertz metamaterial devicesNature, 2006
- Controlling Electromagnetic FieldsScience, 2006
- Composite Medium with Simultaneously Negative Permeability and PermittivityPhysical Review Letters, 2000
- THE ELECTRODYNAMICS OF SUBSTANCES WITH SIMULTANEOUSLY NEGATIVE VALUES OF $\epsilon$ AND μSoviet Physics Uspekhi, 1968